Method for Allocating Ranging Interval and Ranging Sub-channel for Initial Ranging in OFDMA System

摘要

PURPOSE: A ranging interval and ranging sub channel allocation method for initial ranging of an orthogonal frequency division multiple access(OFDMA) system is provided, which reduces ICI(Inter-Channel Interference) between ranging signals in a TDD mode OFDMA wireless communication system. CONSTITUTION: According to the method for allocating ranging interval for initial ranging with a subscriber station in a base station of a multi user orthogonal frequency division multiple access(OFDMA) wireless communication system, a receiving interval of an initial ranging signal is determined by reflecting maximum delay predicted while transmitting and receiving data with the subscriber station. System information required in the initial ranging including the determined receiving interval are broadcasted to all subscriber stations in a cell through a broadcasting channel. And the initial ranging signal from the subscriber stations is received in correspondence to the system information as to all symbols received from the subscriber stations in the determined receiving interval.